PubMedDate not supplied
INTRODUCTION: Bilateral thalamic tumours are very rare and have been recently identified as a subgroup of thalamic neoplasms due to their characteristic clinical presentation, with behavioural and memory disorders and without sensory or motor changes. We describe a patient who presented with mood and behaviour changes due to a bilateral thalamic glioma, discuss the literature related to these rare neoplasms and review the anatomical bases of their particular clinical presentation. CASE REPORT: A 67-year-old woman consulted because of behavioural changes and frequent forgetfulness. Neurological examination was normal except from a deficit in the retention of words and numbers. MR images revealed bilateral thalamic swelling by a isointense in T1, hyperintense in T2 and protonic density mass that did not enhance. The tumour was diagnosed as an astrocytoma by stereotactic biopsy. She continued to deteriorate and a year after diagnosis she was bedridden and with a severe dementia. CONCLUSION: Bithalamic tumors, as other lesions that affect the thalamus bilaterally, characteristically present with mood and behaviour changes and memory impairment.